The magnets in the pack stick to each other very well. The magnets do not seem to stick to other metal with the same strength. Just for example, I use a magnetic phone holder in my car. A metal plate is stuck to your phone and the magnet gets mounted to the car. It holds my phone very well, doesn't slip or drop ever. I tried using one of these magnets from the pack on the same metal plate and it doesn't hold it nearly as strong. It will stick to it, but not enough strength to keep the phone from slipping off.